Cognate interaction with iNKT cells expands IL-10-producing B regulatory cells

Emilie E Vomhof-DeKrey, Jennifer Yates, Thomas Hägglöf, Paula Lanthier, Eyal Amiel, Natacha Veerapen, Gurdyal S Besra, Mikael C I Karlsson, Elizabeth A Leadbetter

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Successful induction of B-cell activation and memory depends on help from CD4+ T cells. Invariant natural killer T (iNKT) cells (glycolipid-specific, CD1d-restricted innate lymphocytes) provide both cognate (direct) and noncognate (indirect) helper signals to enhance B-cell responses. Both forms of iNKT-cell help induce primary humoral immune responses, but only noncognate iNKT-cell help drives humoral memory and plasma cells. Here, we show that iNKT cognate help for B cells is fundamentally different from the help provided by conventional CD4+ T cells. Cognate iNKT-cell help drives an early, unsustained germinal center B-cell expansion, less reduction of T follicular regulatory cells, an expansion of marginal zone B cells, and early increases in regulatory IL-10-producing B-cell numbers compared with noncognate activation. These results are consistent with a mechanism whereby iNKT cells preferentially provide an innate form of help that does not generate humoral memory and has important implications for the application of glycolipid molecules as vaccine adjuvants.

Original languageEnglish
Pages (from-to)12474-12479
Number of pages6
JournalNational Academy of Sciences. Proceedings
Issue number40
Early online date21 Sept 2015
Publication statusPublished - 6 Oct 2015


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